Chances are you will damage the charger (and possibly the devices). Each device could easily want 2.0 amps (depends on the device).

Also, sometimes there is a "charging protocol" between the charger and the device, and connecting in parallel could mess that up. There are a variety of signalling methods (could be proprietary or standards based) used to determine charger capacity.

There is always a chance it will work, but it could just as easily burst into flames.